Quantum phases driven by strong correlations

TL;DR

This paper explores how strong electron correlations can lead to novel quantum phases such as non-Fermi liquids, unconventional superconductors, and topological semimetals, challenging traditional theories and opening pathways for quantum technology.

Contribution

It demonstrates the creation of exotic quantum phases driven by strong correlations in electron systems, highlighting their potential for future quantum applications.

Findings

Identification of quantum critical states violating Fermi liquid theory

Discovery of unconventional superconductivity beyond BCS framework

Induction of topological semimetals via Kondo interactions

Abstract

It has long been thought that strongly correlated systems are adiabatically connected to their noninteracting counterpart. Recent developments have highlighted the fallacy of this traditional notion in a variety of settings. Here we use a class of strongly correlated electron systems as a platform to illustrate the kind of quantum phases and fluctuations that are created by strong correlations. Examples are quantum critical states that violate the Fermi liquid paradigm, unconventional superconductivity that goes beyond the BCS framework, and topological semimetals induced by the Kondo interaction. We assess the prospect of designing other exotic phases of matter, by utilizing alternative degrees of freedom or alternative interactions, and point to the potential of these correlated states for quantum technology.